How to Hide Popup by Supsystic Admin Menus

function plt_hide_popup_by_supsystic_menus() {
	//Hide "PopUp by Supsystic".
	remove_menu_page('popup-wp-supsystic');
	//Hide "PopUp by Supsystic → PopUp by Supsystic".
	remove_submenu_page('popup-wp-supsystic', 'popup-wp-supsystic');
	//Hide "PopUp by Supsystic → Overview".
	remove_submenu_page('popup-wp-supsystic', 'admin.php?page=popup-wp-supsystic&tab=overview');
	//Hide "PopUp by Supsystic → Add New PopUp".
	remove_submenu_page('popup-wp-supsystic', 'admin.php?page=popup-wp-supsystic&tab=popup_add_new');
	//Hide "PopUp by Supsystic → Show All PopUps".
	remove_submenu_page('popup-wp-supsystic', 'admin.php?page=popup-wp-supsystic&tab=popup');
	//Hide "PopUp by Supsystic → Settings".
	remove_submenu_page('popup-wp-supsystic', 'admin.php?page=popup-wp-supsystic&tab=settings');
}

add_action('admin_menu', 'plt_hide_popup_by_supsystic_menus', 11);

Where do I put this code?